Electric heating device



March 1927' A. BER'STED ET ELECTRIC HEATING DEVICE Filed Feb. 15. 1925Patented Mar. 29, 1927. 1,622,485 UNITED STATES PATENT QFFICE.

ALFRED IBERSTED AND MARTIN BERSTED, 01".CHICAGO ILLINOIS, ASSIGNORS TOBERSTED MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A COEAR'INERSHIPCOMPOSED OF MARTIN BERSTED AND ALFRED BEBSTED.

ELECTRIC HEATING DEVICE.

Application filed February This invention relates to an electric heatingdevice of that type involving a resistance coil arranged upon a platemember which is adapted for making wafi'ies or for other purposes andconcerns itself primarily with a structure that saves insulatingmaterial, and is cheaper to manufacture.

The invention comprises the novel structure and combinations hereinafterdescribed 0 and more particularly pointed out and defined in theappended claims.

In the accompanying drawings which illustratc a preferred embodiment ofthis invention and in which similar reference nu merals refer to similarfeatures in the different views:

Figure 1 is a top plan view of the heating device.

Figure 2 is a bottom plan view of the same.

Figure 3 is an enlarged sectional detail view illustrating theassembling of the heating device.

Figure 4 is a sectional view upon the line IVIV of Figure 1.

Figure 5 is an enlarged sectional view through the contact pads takenupon the line V- V of Figure 1.

Referring to the drawings. there is shown a circular plate 1 preferablyformed of sheet metal which is non-insulating having depressions 2stamped therein from its bottom face to form raised portions orprojections 3 upon its upper face. These projections are apertured forreceiving rivets 4. Each rivet passes through a washer which ispositioned against the head of such rivet. an insulated disk 6 whichfits in the depression and abuts the lower surface of the plate. alarger insulated disk 7 which rests on the top of the projections. and aU-shaped clip or clamp 8 which is seated upon the disk 7: the rivetbeing swaged over the web of the U clip. This structure avoids makingthe whole plate 1 of insulating material.

The resistance coil 9 is confined in these U-shaped clips. and supportedupon the insulated disks 3. The coil is laid in such clips; the armsthereof are then bent over into overlapping relation to confine thecoil, as clearly shown in Figure 4.

In order to lead an electrical current into and from the coil 9, a pairof insulated pads 10 are attached to the plate 1, one on 13, 1825.Serial No. 8,869.

each side thereof. Hollow rivets 11 may be used to attach the padstogether on the plate 1. A pair of binding posts 12 extend through thesepads; the plate 1 being provided with a pair of enlarged apertures 13for receiving the posts 12. These apertures are sufliciently large toprevent short circuiting. The current is adapted to enter through theseposts which are connected by short conductors 14: with the terminals ofthe coil 9.

From the foregoing. it will be appreci ated that a simple structure hasbeen provided wherein the coil is effectively retained upon its base ina very simple manner.

IV e are aware that many changes may be made, and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention. and we therefore do not purposelimiting the patent granted hereon, otherwise than necessitated by theprior art.

We claim:

1. In a wattle iron, a base member having depressions in its lower faceforming rising projections upon its upper face. iJ-shaped clips rivetedupon said projections and insulated from said base, and a resistancecoil confined in said clips, the arms of said clips being folded oversaid coil.

2. In a heating device. a base plate having hollow rising projections.clamping members secured to the tops of said projections and insulatedfrom said base. a coil secured by said clamping members. said membershaving overlapping parts for engaging over said coil.

3. In a heating device a base member having projections rising from itsupner surface. insulated disks upon said projections. L shaped memberssecured upon said disks. and a coil positioned between the arms of saidU-shaped members and resting upon said disks. said arms being foldedover said coil.

4. In a heating device of the class described, a base member havingprojections rising from its upper surface. insulated disks upon saidprojections, clamping means upon said disks. and a coil confined by saidclampmg means.

In testimony whereof we have hereunto subscribed our names.

ALFRED BERSTED. MARTIN BERSTED.

